As a satellite conference to the Fourth Congress of European Mathematics held at StockholmUniversityin2004, theInternationalConferenceonPseudo-Di?erential Operators and Related Topics was held at V] axjo ] University in Sweden from June 22 to June 25, 2004. The conferencewas supported by Vaxj ] oU ] niversity, theFIRB Research Group on Microlocal Analysis of Universit a di Torino, and the Int- national Society for Analysis, its Applications and Computation (ISAAC). The conferencewas well attended by about 50 mathematicians fromBulgaria, Canada, Denmark, England, Finland, Germany, Italy,...